Barnes SE51A, Installation And Operation Manual

Page: 14 / 32

14
Position unit upright, using blocks to avoid resting unit on
shaft. Unscrew cable hex bolts (11) and remove compression
fl ange (16a) and power cord (16). Remove snap ring (19) with
a fl at head screwdriver. Pull the terminal block (21) out of the
housing (6) using a T-bolt or pair of pliers and a .25-20 screw
in the threads of the terminal block (21). Be sure to leave
slack on the motor leads connected underneath. Use needle
nose pliers to pull each female connector off of the pins on
the underside of the terminal block (21) see Figure 11. The
unit voltage should be noted. Repeat cable and terminal block
removal procedure for any control cables (56) if equipped.
Remove socket head cap screws (47). Vertically lift the motor
housing (6) from seal plate (5) by lifting handle (13). Inspect
square ring (27) for damage or cuts. Remove the motor bolts
and lift motor stator from seal plate (5). Disconnect capacitor
leads from capacitor (9, single phase units). Examine bearing
(25) and replace if required. If replacement is required, remove
bearing (25) from motor shaft using a wheel puller or arbor
press, see Figure 12
Check motor capacitor (9, single phase units) with an Ohm
meter by fi rst grounding the capacitor by placing a screwdriver
across both terminals and then removing screwdriver. Connect
Ohm meter (set on high scale) to terminals. If needle moves
to infi nity (∞) then drifts back, the capacitor is good. If needle
does not move or moves to infi nity (∞) and does not drift back,
replace capacitor (9). To test the fl oat switch (55 or 56 optional),
check for continuity between the pin receptacles of the cord
with the fl oat in an “up” position. There should be no continuity
with the switch in the “down” position. Replace switch (55
or 56) if malfunctioning. If moisture sensors (4, optional) are
damaged, disconnect leads by removing machine screws (45)
and washers (46) from probes (4). Remove probes (4) from
seal plate (5). To test the temperature sensor (50, optional),
check for continuity between the black and white wires. If
found to be defective, contact a motor service station or Barnes
Pumps Service department. Inspect motor winding for shorts
and check resistance values. Check rotor for wear. If rotor or
the stator windings are defective, the complete motor must be
replaced.
IMPORTANT! - All parts must be clean before
reassembly.
F-4.2) Reassembly:
Moisture Sensors, DS Models -
If pump is equipped with
optional moisture sensors, reassemble by applying thread
compound to threads on probes (4) and install in upper seal
plate (5), see Figure 20 & 21. Connect wire assemblies (53) to
probes (4) with washers (46) and machine screws (45).
Thermal Sensors - If pump is equipped with optional thermal
sensors, use terminal connectors (52) to connect wire
assemblies (51) to sensor leads. If sensor is not functioning,
contact factory approved Service Center or Contact factory
Service Department.
Bearings - When replacing bearing, be careful not to damage
the rotor or shaft threads. Clean the shaft thoroughly. Press
bearing (25) on the motor shaft, position squarely onto the
shaft applying force to the inner race of the bearing only, until
bearing seats against the retaining ring (24) (Included with
motor).
Motor - Slide lower bearing (25) and motor shaft squarely
into the seal plate (5) until bearing seats on the bottom. Place
stator over rotor, lining up motor bolts with holes in seal plate
(5). Position capacitor (9, single phase units) so that it will lay
on the opposite side of the cable entry bosses of the motor
housing (6). Reconnect capacitor leads. Torque motor tie bolts
to 17 in-lbs. Set square ring (27) in groove on seal plate (5).
F-4.3) Wiring Connections:
Check power cables (16) and control cable (56, if used), for
cracks or damage and replace if required (see Figure 14).
Make internal wiring connections which are independent of
the terminal block as shown, using connectors (48) and wire
assemblies (49) and (63) as required. Do not use wire nuts. Slip
motor leads and groud wire through fi berglass sleeve. Lower
motor housing (6) down onto seal plate (5) while aligning holes
and stringing motor leads through the cable entry bore(s).
(Slipping cords inside a 1 ft. length of .5” conduit makes this
easier). Place socket head cap screws (47) through seal plate
(5) into motor housing (6) and torque to 60 in-lbs.
FIGURE 12
FIGURE 15